The Ultimate Guide to High Availability with MariaDB

Comments - How to insert only the number of data specified by mariadb?

3 years ago Daniel Black
Re: How to insert only the number of data specified by mariadb? [Answer]

To your `Theater (id, description)` table add a field of `remaining int default 100`.

Use transactions when making the reservation:

BEGIN
UPDATE Theater SET remaining=remaining-1 WHERE id=1 AND remaining>1
(in application code, examine ROWS_AFFECTED from this update and if not 1, ROLLBACK + no seats available
INSERT INTO Reservation ...
COMMIT
 
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